Chain wrench.



No. 698,794. 'Patented Anr. 29, i902.

'[. w. BUFFHD.

CHAIN WRENCH.-

(Application led July 13, 1901,.)

(No Model.)

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l .Geazyezaffond UNTTED STATES PATENT Ormes.

GEORGE W. BUEFORD, OF BROOKLYN, NEW YORK, ASSIGNOR TO J. Il. WILLIAMS AND COMPANY, OF BROOKLYN, NEW YORK, A OORPORA- TION OE NEr YORK.

CHAIN WRENCH.

SPECIFICATION forming part of Lettersv Patent No. 698,794, dated April 29, 1902.

Application filed July 13, 1901.

of small diameter connecting pipes of largerA diameter.

A wrench made in accordance with the present invention is so` constructed and organized that the pipe or other article to be grasped isy squarely embraced between the reversible flat chain on one side andeither of the op' posing grip-faces on the other.

The present improvements are illustrated in the accompanying drawings, in which- Figure l is a side view showing the wrench in use, only part of the handle, however, being shown. Fig. 2 is a longitudinalsection. Fig. 3 is a cross-section on a plane indicated by the line 3 3 in Fig. 2.

Referring to the drawings, A is the handle, B is the head, and O is the chain.

Only a portion of the handle A is shown. The head B is secured to the end of the handle in any suitable way. As here shown, the head is formed with a tubular socket a, terminating within near the apex of 'the head in a screw-threaded recess. The end of the handle has 'a cylindrical section b, which" fits snugly within said socket and at its extreme end hasa projecting screw-threaded stud c, which screws into said screw-threaded recess. This construction insures a secure and rigid connection between the handle and the head.

The head is provided with gripping-teeth on its opposite faces d CZ, and these faces are in line with the handle, so that a medial longitudinal plane passing through the handle bisects the said grip-faces.

The head is centrally disposed with reference to the axis of the handle, and each of its grip-faces is continuous from side edge to side edge and extends across the plane of the sereine. 68,155. (no modelo being arranged in succession, with a pair of parallel internal links'g g lying side by side and apair of parallel external links h h embracing the links g g and pivotally connected by a cross-pin E, preferablyv connected immovably (by riveting or endwise compression) with the outer links 71I h and passing loosely between the inner links g g, which swivel thereon. The terminal link F, connecting the chain and swivel-block, is shown as com'- posed of two of the inner links g g. The pins E E project outwardly on both sides of the chain to constitute projecting locking-studs t' t', which interlock with suitable locking pro-A visions G G, carried by the swivel-block at its other end so as to be always diametrically opposite to the chain-pivot. These lockingstuds on the chain may be omitted throughout that portion of thechain nearest the pivotpin E, which can 'under no circumstances register with the locking provisions G G; but to avoid showing a long section of chain in Fig. 3 said studs are illustrated closer to the said pivot-pin'than is necessary in practice.

The locking provisions G G, which coperate with the studs i t', consist of two projecting ears j j, integral with the swivel-block, provided on their inner sides with suitable locking-recesses adapted to receive the chainstuds when the chain is passed between them. These locking provisions are preferably constructed like those of United States Patent No. 499,508, dated June 13, 1893, so as to prevent the chain from accidentally dropping out when used underneath the handle.

When the present improved wrench is used, the chain is passed entirely over the head, so as to embrace the article to be turned squarely between the chain and one of the grip-faces of the head, the chain-studs being then interlocked with the locking provisions on the swivel-block. Owing to the connection ofthe chain with the swivel-block, the swiveling of said block and the locking provisions being on the swivel-block, the wrench can be used with either grip-face up.

When the Wrench is in use, the chain passes from its pivot in contact with the article to be turned, thence over the central head in contact with its apex, and thence in contact with the further grip-face to the locks.

Preferably, as shown, the head is provided withslightly-projectingchain-retainingshoulders 7c 7a, between which the chai-n lies when in use, so that the chain cannot slip laterally off from the head while in use.

I claim as my inventionl. A chain wrench having, in combination,

a handle having a cylindrical section at one end separated from the rest of the handle by a shoulder and a screw-threaded stud at the outer end of said cylindrical section; a central head composed of a single piece having opposite continuous grip-faces with projecting chain retaining shoulders at the side edges, said grip-faces extending across the plane of the handle, said head having a cylindrical socket terminating near the apex of the head in a screwthreaded recess, said socket and recess receiving the cylindrical section and screw-threaded stud of the handie; a swivel-block turning on the cylindrical section of saidy handle between thebase of the head and the shoulder of the handle, said swivel-block having on one side a chain connection and on the other side of the handle locking provisions; and a dat chain having locking-studs, said chain being pivoted to said swivel-block on one side and being adapted to be carried over the head in coperation with the grip-faces thereof and to be locked to said swivel-block locking provisions on the other side of the handle, said head and chain beingso'related that the article operated upon is grasped squarely between the chain and one grip face of the head, and the chain comes in contact with the other grip-face.

2. A chain wrench having, in combination, a handle; acentral head having opposite continuous grip-faces extending across the plane of the handle; a swivel-block turning on said handle at the base of the head, said swivelblock having on one side a chain connection and on the other side oi the handle locking,l provisions; and a chain pivoted to said swivel-block on one side and being adapted to be carried over the head Ain cooperation with the grip-faces thereof and to be locked to said swivel-block locking provisions on the other side of the handle, said head and chain being so related that the article operated upon is grasped squarely between the chain and.

one grip-face of the head, and the chain comes in contact with the other grip-face.

3. A chain wrench having, in combination, a handle; a central head having opposite continuous gri p-faces extending across the plane of the handle; a swivel-block turning on said handle at the base of the head, said swivelblock having on one side a chain connection and on the other 'side of the handle locking provisions; and a chain pivoted to said swivel on one side and being adapted to be carried over the head and to be locked to said swivelblock locking provisions on the other side of the handle, said head and chain being so related that the article operated upon is grasped squarely between the chain and one grip-face of the head, and the chain comes in contact with the other grip-face. p

4. A chain wrench having, in combination, a handle; a central head having opposite continuous grip-faces extending across the plane of the handle; and a swiveled chain adapted to be carried from one side over the head and to be locked on the other side, said head and chain being so related that the article operated upon is grasped squarely between -the chain and one grip-face of the head, and the chain comes in contact with the other gripface.

5. A chain wrench having, in combination, a handle; a central head having opposite continuous grip-faces extending across the plane of the handle and having projecting chain-retaining shoulders at the side edges; a swivelblock turning at the base of the head, said swivel-block having on one side a chain connection and on the other side of the handle locking provisions; and a chain pivoted to said swivel on oneside and being adapted to be carried over the head between the projecting shoulders thereof and to be locked to said swivel-block locking provisions on the other side of the handle, said head and chain being so related that the article operated upon is grasped squarely between the chain and one grip-face of the head, and the chain comes in contact with the other grip-face.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses'.

GEORGE W. BUFFORD. Witnesses:

WILLARD P. ScHENcK, WILLIAM C. REDFIELD.

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